Composition of calligraphy is a university question. Some people have written very good words, but when they are written into works, they become very poor works. Some people have participated in calligraphy competitions, and their vocabulary skills are already very deep, but because their compositions are not standardized, they have not won the prize.
There are also many profound theories and norms in the composition. The composition of each word in a real cursive script is also different, and the font size is also related to the composition. Banners, couplets, nave and banners are also different.
There are also many books about composition. Yang Zaichun's books on composition of running script and composition of running script are widely circulated in the market for reference. Tian's lectures and regular script are also more, and others can also be found in online search or bookstores.
The landlord's question needs a thick book to answer, so it is difficult to answer. It might be better if the questions were more specific and detailed.